Blow-torch.



G. E. HOLMGREN.

BLOW TORCH.

APPLICATION F|LED FEB. 23, 1917.

1,236,172. Patented Aug. 7, 1917.

IN VEN TOR.

A TTORNEY.

GUSTAF E. HOL1VIGREN,- OF DULUTH, MINNESOTA, ASSIGNOR OF ONE-HALF TO HUGO FREIMUTI-I, OF DULUTH, MINNESOTA.

BLOW-TORCH.

Specification of Letters Patent.

Patented Aug. 7, 1917.

Application filed February 23, 1917. Serial No. 150,414.

To all whom it may concern:

Be it known that I, GUsTAr E. HOLMGREN, a subject of the King of Sweden, residing at Duluth, in the county of St. Louis and State of Minnesota, have invented certain new and useful Improvements in Blow-Torches, of which the following is a specification, reference being had therein to the accompanying drawing.

This invention consists of certain new and useful improvements in blowtorches and relates particularly to that class of torch used in connection with a container to which may be applied air pressure as in the common hand blowtorch well known to the trade.

The principal object is to produce a torch in which kerosene may be used in place of a more volatile liquid such as gasolene and the like which are commonly used in blowtorches.

Another object is to produce such a device part of this application and in which like reference characters indicate like parts:

Figure 1 is a side elevation of the im- 7 proved torch.

Fig. 2 is a vertical, central, longitudinal, sectional view thereof, and

Fig. 3 is a rear elevation of the head of the torch with portions removed for better comprehension.

The head of the torch is of cast metal and comprises the cylindrical, horizontal portion 1 and depending vertical portion 2. A passage-way 3 is formed in the portion 2 and communicates with a similar passageway 4 formed at right angles thereto in the horizontal portion 1 of the head.

A screw-threaded needle valve stem 5 protrudes within the passage-way 1 through the rear end 6 of the portion 1 and a leak proof joint therewith is accomplished in the usual manner by a stuffing nut or cap 7. This plurality of disks 9 of fine wire screen. In practice I employ preferably six such disks.

These pieces of screen are held in place by the end of the portion 2 being externally screw-threaded and the hollow cap member 10 screwed upon the portion 2 until it impinges the pieces of screen as clearly illustrated in Fig. 2.

The lower elongated end of the cap 10 is internally screw-threaded as at 11 for attachment to a suitably formed nipple on a container or on whatever device the torch is to be attached.

The object of the screens 9 is to break up the volume of kerosene as it enters the passage-way 3 and to a certain degree tend to vaporize same, as it is found that without such, when the flow of kerosene is uninterrupted, the efficiency of the torch is materially reduced.

The face plate 12 of the torch head is circular in form, eccentric to the horizontal portion 1 and formed integral therewith. Adjacent the lower edge of the face plate and communicating with the passage way 4: is a passage-way 13 which is controlled by the needle valve as at 14.

Attached to the face of the plate 12 and communicating with the passage-way 13 is the small copper or brass pipe 15 which eX- tends forwardly for a distance approximately the length of the head and is bent upwardly and spirally into a coil 16 which is designed to snugly fit the sheet metal casing 17 which surrounds it. Then the pipe is returned toward the face plate 12 from the uppermost point of its last coil as indicated at 18 and is securely attached to the face plate 12 somewhat above the central protruding hollow nozzle 19 which is formed integral with the face plate. A U-shaped passage-way 20 is formed in the face plate 12 and provides a communication between the hollow nozzle 19 and the pipe 18.

By this arrangement it is seen that the liquid to be burned as fuel in the torch passes from the needle valve, through the pipe 15, coils 16 and pipe 18 to and-through the"nozzle'l' lthe discharge of which is 00111- paratively very small anddesigned onlyto discharge the fuel after being converted into a highly combustible gas.

The conversion of the kerosene from a liqiiidto a' gas is caused by the prolonged heating process as it passes through the pipe and said heat after first being properly started is maintainedby the continued combustion of thegas as it is-discharged from the nozzle and passes throughthe coil on itsultimate mission of service bey'ondthe front end of the torch.

This prolonged subjection "to "heatof the l ke'ros'eiie'in passing through the coiled pipe is necessary to overcome the low volatility of the kerosene and the embodimenther'e disclosed haslprovedin practice to work ad- 20 inirably though itis to be understood various modifications Within the scope of the invention may be resorted to Without dep' artingfrom the spirit thereof.

. ,The-inetal casing 17' is of elongated cylindrical'form and fits tightly over ;the face plate 12 Which supports it. The Walls ofthe opposite end just beyond the coils 6 converge slightly forming a somewhat funnel lshaped terminus or nozzle 21, the object of ao vvhic'h is to somewhat deaden'fthe "circulation of air in direct contact'yvith' the coils {6 and maintain the "proper temperature th erc zabout. w Thelo'wer half of the barrel portionbf 'the casing-'17"is'entirelycut as at 22 excepting a'i'elatively short portion at each "and as clearly ill'ustratedand a plurality .of small vent holes 23 are formed through 'the forvva'rd "portion thereot'a'djacent the 40 end21.

, Through-the faceplate 12 adjacent the "circumferentialedge thereof are formed two opposed openings 24' 24: for supplying air inback of the"noz zle'19 and Which are essential to thep'roperworkin of the de vice.

Intermediate of these vents, abutting the {rear Wall of the faceplate and resting upon thetop of-the horizontal portion 1 of'the head is a small tank 25. On the'front end of the' tank is formed a lug 26 which rests "'up'on'the adjacentend of thecas'ing'l'? and is fastened through the casingto the'face 1 plate by asuitable screw bolt 27 Which holds -the" tank securely in, place.

To one side of the lower portion of the tanl25 is attacheda pipe 28 havi'ng a suitable spigot'valve 2'9 installechtherein for f controlling the discharge through the pipe.

The'opposite end "of the'pipe 28 is'attached 'to the rear end Wall of t11e1primin pan 30 Which latter -is"-siispended in any desired "and convenient manner fromfthecasing 17 astly the straps 31. This priming'pan or cup-ma be'of'any desired form and isfas lindrical casing sum-mounting the pipe coil and attached to the faceplateand means'for passage-Way'therethrough, a needle controlgen'd' of the passage-Way" substantially as and for the purpose described.

Well known in the art, for holding the liquid usedin the initial heating of the torch. In

I K the common-form of gasolene torch, this pan is filled directlyfrom the fuel supply used in the torch but When kerosene is being used in the torch as herein described, need of some more volatile liquid such as gasolene or the like becomes essential for a quick and efficient initial heating or priming, thus I have provided the tank 25 for carrying a supply of suchpriniing liquid. Thetan'k tank.

Having thus de'scribed' my inventiontvhat I claim as new and 'desiret'o'seciire byLetters Patent, is: y g I g 1. A blo'Wt'orch of the character described, comprising a substantially 'T' shaped "head having an enlarged, "eccentric, circular shaped face plate formed upon'one end thereofla fuel supply passage wayin the head'and discharging be'lo'W thecenter of'the faceplate, an axial nozzle "protrudingifrom the faceplate and communicating "with a passage-way "above the c nter "of the fa'ce plate, a "spirally"coiledtube, the coils "of Which are spaced a distance from theend of the nozzle and concentric therewith, the receiving 'and discharging endsof said c011 communicating 'with the first and "second mentioned passage-Ways respectively, 1 a cycontrolling the supply of oil'to the torch.

2. Thecombinatiomvvith asubstantially T-shape'd blovvtorch head having an angular '105 ling valve Within the saidpa'ssage way-and a spiral 'l'ieati'ngcoil communicating with said passageway, ofa plurality of Wire screen disks installed-witliin the receiving 3. The combination 'With a substantially T-s'haped blo'wtorch head h 2m izmgu' lar passage-Way therethrough'and aneedle controlling valve installedin the angle of the passage Way, 'of a vaporizingmetal screen installecbwithin the receiving-end of the passage-Way, a lieatingand conducting tube communicating with the discharge end of thep assage-Way andle'Xtending outwardly a considerable distance therefrom, a plurality 'of'spi'ral coilsi'n the extended portion of the tube and a return extension of thetube connected to thef torch head, *a discharge nozzle'fixed to the-headand discharging centrally through the spiral coils, a passage- "The combination with a torch *head'130 having an angular passageway therethrough controlled by a needle valve and a vaporizing screen in the receiving end of the passage-way of a circular, eccentric face plate formed integral with the horizontal portion of the head, a discharge nozzle extending from the center of the face plate, a coiled conductor pipe extending outwardly from the face plate and attached theretoone end of the pipe communicating with the nozzle and the opposite end with the supply passage-way in the head and the coils in the pipe being concentric with the nozzle, a casmg carried by the face plate and surrounding the pipe, a portion of the lower half of the casing being cut away and horizontally opposed vent openings in the face plate sub stantially as and for the purpose described.

5. The combination with a kerosene blowtorch comprising a head having a horizontal portion, a circular upwardly extending eccentric portion, a cylindrical casing carried by the eccentric portion and a priming pan suspended below the casing, of a tank carried upon the horizontal portion of the head adjacent the eccentric portion and a valve controlled pipe connection from the tank to the priming pan whereby a more inflammable liquid than kerosene may be carried by the torch for priming purposes.

In testimony whereof I hereunto affix my signature in the presence of two Witnesses.

GUSTAF E. HOLMGREN.

Witnesses:

S. GEO. STEVENS, HUGO FREIMUTH.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. 0. 

